Jay Holovacs writes:
> ----------
> > From: Russell Nelson <[EMAIL PROTECTED]>
> > To: [EMAIL PROTECTED]
> > Subject: Eason/Kawaguchi stego
> > Date: Tuesday, June 29, 1999 9:27 AM
> >
> > . Also, only a
> > few parameters are needed to retrieve the information, so anybody with
> > the appropriate detector and a few guesses can find the information.
> > Yes, that's right, it's only hidden from view, not from even the least
> > determined observer.
>
> But if data is properly encrypted first, noise extracted from any picture
> should be virtually indistinguishable from encrypted data. Stego is really
> just obscurity with plausible deniability, it should never be used without
> encryption.
I don't know of any stego packages that work with mass-market
cryptography e.g. pgp or mixmaster. You can't just take the output of
one of those crypto systems and stuff it into the "random" bits of a
real-life sample. There's too much plaintext for the stego to hide.
Stego needs a special type of cryptography that has no known plaintext
in its encrypted output -- where the output of the stego algorithm is
just as white as the white noise it replaces.
So you've got a chicken-and-egg problem -- you have to have yet
another set of public keys for your stego crypto algorithm.
But besides that, you need software which camps on every source of
"random" bits that come into your life, cryptanlyzing it using your
private key.
--
-russ nelson <[EMAIL PROTECTED]> http://crynwr.com/~nelson
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